How do I upload a CSV file with my business tax return in TNTAP? You can find instructions on how to upload the CSV file and the CSV file format on our website here. March 19, 2019 14:36 Related articles TNTAP: Filing a Sales Tax Return TNTAP: Filing a Business Tax Return How do I file business tax online? How do contractors deduct payments made to subcontractors on their business tax return? As an out-of-state seller making sales into Tennessee, how do I file my 2019 annual sales and use tax return to include both the local uniform sales tax rate and the local sales tax rate for each jurisdiction?